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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7a2bc52f8bb3172bed788ad8093117cf847f8d35d1e1311e8d162b41f74014' 
  AND token = 'dd2anhWI/CVk95sBr1wH1fqj75mdzHDN0Ll+5FRblAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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