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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76395dbb8d24f4c6f349069ec69bf6f36804c6b3b2f7b003046c9b62ab59de1c' 
  AND token = 'GGNl6y0dOO6NFoSYRN4L2DgaH0h68x8apcMhP8vHZLM=' 
  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"
    }
  }
}