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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0166e3a85a14a3df658fc9ddd2a88d8d0f451784eab2171660dccd57c73642c' 
  AND token = 'q+f3B8OrMvjrb58Iik8+Nx5TcfMoZN54xommum0Q/j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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