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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666bf852e69424789d4ac6e2a12753dea7d8e5a710b561cc763e64fcd0251dad' 
  AND token = 'gfun1377p89OaAsSWCGFb80zp4gZibQMfoTen/vGgt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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