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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54add8d97bfa43f65148793b9e2b3b40ae6082bca22e879ecdf04c9a162d098d' 
  AND token = 'S0Ro/hXcY8iEEAL57o3WDWzb0nMc/gf9RvJVEaPRKes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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