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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d610ed8c553748f4b3559cb5d5ce7284a2ed899e8bc52f9e38c4462012a760' 
  AND token = 'q+B32cS6kklr9vucxGfIdoUJc4TBjdF21HPOogzPHrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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