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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9fde5c2fc4ae3b9fd0b975fc2da29a576e4488e0fef547645e7798843fc5b9' 
  AND token = 'Y2BqzesacLBzjo70cN0kW21+AFhbbP/MWMMuLYkHTHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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