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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57ee3fcfe6b21b59a0217f5882ff7fffc4b970f145cd491b847ef02050ec6b1' 
  AND token = '9R/M17ssVpc0m5uMO+OVN++jtle9+bU2c2d9UAEgwOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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