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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e452b1789f62f22c1dd0d92b375b7596bc2975202f4cf61cf27d01cc2f3c8567' 
  AND token = 'J0XsETpttprGtnf+HCiZV6gD4knM5W1SyxA/AxRGDEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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