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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e073cf9d549fb08f235e695f27859f7766179075a5db90bf021aa6c39996f4fe' 
  AND token = '3dgn27FJlRm7qErC6fn+pt/yf4DhfQCju1e+zzc60E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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