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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b949d2e1d6b75919e7989666042581249dac6a2df2b3e1ae5350e19a94100ea' 
  AND token = 'AcXM1gd3aPV959ihQXTc46q5KkRRshjEGXk9kqPdqeM=' 
  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"
    }
  }
}