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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b2ee63d3f58ca009a848e23921b19da70c5e15b022e57ecebaeb9013cecf3ea' 
  AND token = 'IlYauPZvxrYyu8Xt+WhZmS+wMGASiegEpJIORL+Xsjg=' 
  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"
    }
  }
}