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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f50bad812ea4601864a887164e96e3f71fd4ab5ee3a0a9f11791e0e3ca77ad' 
  AND token = 'TlGBQaX4uOpsC6iUEfTAZkrBJUOG3PDk4KXgVdnsM6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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