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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59935703613aea1c215d94c328f0cf1670e5c8373cdd1057ce0f0d93a05c8c57' 
  AND token = 'raY28zyEIEdR3yTVo6xaPCyMRfIMgpjeAaz1xiwCR44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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