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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62d2f9a8b3c890b86a20a9660cb902127d6c1f7cae56d1891e95cf4400dc3d5' 
  AND token = 'QQ89sQ46aaQSTwMBYuTo+tW082rh0AiO7HEXeXUbA7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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