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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b78169a46c1f77472998a098188c69a58a9ab6793de644c0535e769e8384220d' 
  AND token = 'eMiO6wgwNPCq1dGG8D12p1OgtNfxKjPWl6q+Sflo+D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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