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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8cd54fc01f35bccd510c90388c0aaec7021ec5dab931410a93f09bcfed46cf' 
  AND token = 'Zfpq+paLirLc1cFtRpV1zI86NN1wKwd7z4+WbC9V/fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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