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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3592d5320cc9de68506e80662e0f5e98ab87cd4ec4d669e3f6f30cdbd9de660a' 
  AND token = 'dIvWyYgzO/wpIAbiquaS2ydCwfIRqVY5+2RJHGdsISQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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