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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f51ab9eb4f35a69eca84eb6196a737ef1a1cc5d926a0ac2bffb168a73ce8e98' 
  AND token = 'VzKNt2OVxg2V1NDwhQW68kq1Ep/vhqWozy23r97GVmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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