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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1939fe2e1a38f6069cf2337538b66bed3f099614491068812adec70003f8732' 
  AND token = '5BHm5aELw4HnIcP8/5mnYssS0L3VCNI98mPuB178w7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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