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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a73c7427071d9d3490cd9f3742cdd9370832ab0dd42b0644824859070eb4faf' 
  AND token = 'ufoV6Pq6unW7TE6AFhp0pEKNHcagiZ+P3MCCqitz4bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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