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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ea1001aee8fbb300a6b1329f6d60bdeb460452faa68c5ee332206f6c116198' 
  AND token = 'EnEcOR0++h9F5yUBAwmu7JtQgM+NCFHFdZAIF3YxqqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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