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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8326c772390b78853a99188e4fb984788822d9e4b144f06bb6c58da3c86590d' 
  AND token = 'nAVgkguG7H8lVqhvNWw8ad3Em83nxV4dXPKl/F+0P9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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