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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2b85348c713a745cdd793343b28d6744d97deedb5100a0216f3e3a225af1a9' 
  AND token = 'RuGjDVYu9vT4wcbDWgoUD+6gE5bippndf9k4TFj+kJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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