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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c422adf8a7158b2a993f9485df3890cae1ecc55b2623fdc654313f262f4fb815' 
  AND token = 'XELq5MG+KkoJ5ABYa1xWZ2QdJ3Rt35va42OEt0/SsyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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