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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb5c71fd3e7e0b559816253b05f3515a07f97183a31616767a213b31812fb4c1' 
  AND token = 'x9eHFr5G/3sqI70Orqr3uaut28ca0F8njr9obfH5Xdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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