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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5f97dca04d447cd2f629ffd52852ba2d281cd72a5f7641c35bddc54abf5f3f' 
  AND token = 'hNz2n8O/EAShTiu3gRUf3fQ3/K+zmLScr1t4akfSCWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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