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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe788fb1ad9162fc6490cac8726ab45b3de203004cb9c3cdac68c9559c88ef63' 
  AND token = 'H/5rD10NvxPsv58m8+KrOAiiytpzxnX+orGSgLl3Lp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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