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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d866ae5371b329aad8544900b291a0bd7a52b745e9df17b8b6f580feea5fcbd' 
  AND token = 'AETtnz3LBw55VPXyLHXESjkUjhXLzotDulkk+KQY5Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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