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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac7bf839502c4380685a8b351940384e4fd96dcb9356875da1fe044670d374b' 
  AND token = 'kBwLlSNtTd+GgDQwXw40YckDWHD3/aSlYEsnquixt0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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