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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd350411316ef2091a51a9dcf0f5811b26c49877ee1273a1ad471b2edd376d2cc' 
  AND token = 'heexQchzRhO5unfZPpPB2OjpQep+7N2ZXmMyMiiTFwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}