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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df7479a6c42cf4ec8b886614133e4bb61a94978e621360660250ecb5421b0c2' 
  AND token = 'EgpOW6NzEzAAnZ2CYWD7dGBexc9qz8jifSO8hGdXEOA=' 
  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"
    }
  }
}