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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab549c27b195f0fb8efc1127061fc729ef966d6fdea0a2a604838dd8fbad78f' 
  AND token = 'Xx6BjGDFFS4bG3lCIopdjg2MsCfwirpLtsm+qN1t408=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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