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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8db78b8b06ef25b7bc985d7490fb2effe6314f5d2bc0b413601b990936a0d59' 
  AND token = '6/xBr7t43361IS1Oy/hPQwR1bu9rNsnyeLcYCQfMAl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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