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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874b49af15b36caf8b615f5ef19db94f605fe32794163c36adaf1c1ed4847831' 
  AND token = '4HJtxp2PrEC9Vmp8Bs/00k7hqZg7UNftSL3SNNCO+cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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