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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71579b21287d7f40b6ef9c0eb942048d14a393f58b7f06456a7d6987cda5c231' 
  AND token = 'fHNYZp2QK4obpv2pIR0Yu96hOJ1YaIAmAVrY3QwOyKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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