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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687133a8e70b4a05cd8cb4c06a1bbe3c51b11ea0737c281981b865bcdb406f97' 
  AND token = 'vFN7/bu1jJrB/S16zT9BHnmxlCotQJ9YvFRc82M6NC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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