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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01f4762889abd3b70f264cdc99136bbc0b637bb337c59781a46adc900e1f5e4e' 
  AND token = '48selPE7ekNVPVu0Gn36n6+uIm+8hFBPEElAcU1oRZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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