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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ea425280a02d3c860d33c29b2837a2224c74f1dc8e9dc49d9d7a7406738f2d' 
  AND token = 'bSqVoSXp9NVChDDqHSszk/Qg0AdfWY8LE71nSAoI/8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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