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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beec00bb02c1d0be78b998bc88147d16eae55156be880bed2064f216396c4c09' 
  AND token = 'Wwu4ewkL0aK+6X6mG0NWDh6cXYhkGQdWvpWZdAQX1DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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