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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9291d8fbfbf97073d195e117ce30dc05148c5ddc96fc214cf42f77624fc5689c' 
  AND token = 'H3vcNCUEo3HEuWMb64Vpm5uQM7toAUp8EQ7ITlKzwNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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