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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379ac8d2e7e0bd3707c2a4960292b6d920527b043da8f73ad5ebcba62fe12342' 
  AND token = 'tGaDqtHPW1cj/tp96ccuXVmd9qeiFw54LWdYFRKtmIs=' 
  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"
    }
  }
}