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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c338316d25711f555b46e9558e5cb09b7ef7b409cc75d779ff2a8c72d765d8ea' 
  AND token = 'tqbPN/eR5A1vN0zNSWTH3BTgrSBXBIH6rX9sM5WME1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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