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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d47c83aabe10215a40ecdafe91e4fc6ae5c9caece698b00c5aa860fec08132b' 
  AND token = 'DRT/81N+KK+PVkeoiYlPJ0mNUTaCsVXiqn08Ix7da8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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