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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ba20f936a98560ab1326e73cdf3f1ed6257b735917d00f93b49f6f4cb94e8c' 
  AND token = 'joe08aAUgf6PCneaHTreTEy3pnGIuVMiZ5Y0ergNy4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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