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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291f9192ed4c77e0d402adbb0492221c10b60181588eb56b527568ce1d1b39b8' 
  AND token = '+OQdbZA/9OyaLMMiZ5IEA3yrw49jjSP33PZzCxcbtaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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