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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e6f9994bd1062bb4340def8d72198fd6fcc13fdfd0d38c853f2fc3dbf64725' 
  AND token = 'GiXG2CNipPMaHhiiRjrE5SFVclZT+l3Ox16YuSTb6dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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